Sheet-guiding mechanism.



J. W. DICKINSON.

SHEET GUIDING MECHANISM.

APPLICATION FILED APBJI, 191a.

Patented June 2, 1914.

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'A yigj WWW-coma J. -W. DICKINSON.

SHEET GUIDING MECHANISM.

APPLICATION FILED APB7, 1913.

Patented June 2,

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JOSEPH W. DICKINSON, OF CRANFORD, NEV! JERSEY, ASSIGNOR TO THE SCHUBERT PIANO COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

SHEET-GUIDING MECHANISM Specification of Letters Patent.

Patented June 2, 1914.

Application filed April 7, 1913. Serial No. 758,266.

ment of sheets or webs, such for instance as perforated music sheets, the object of the invention being ,to provide an improved mechanism of this character simple in its construction and positive in its action, and by means of which the music sheet will be automatically maintained in its proper position relatively tothe tracker board or bar so that'the perforations of the music sheet will properly coincide or track with the corresponding perforations or apertures of the tracker board during the playing of the instrument, and which mechanism may also be readily adjusted'to correspond with different widths of music sheets, the presentorganization being in .part an improvement upon that shown and described in my contemporaneously pending applications.

An object of the present improvement is the provision of an improved mechanism of this kind in which the necessity of using an adjustable port is avoided, while all the advantages of such an adjustable portare re tained.

Vlhere an adjustable port is used, if it is a perspect1ve view of this improved mechaaccidentally struck by the hand and thrown out of its proper adjustmentthe operator sometimes fails to re-adjustit into its proper position. By the present organization, howevcr it is not possible to throw the port out of its proper position, so that after it is once adjusted by the manufacturer it does not have to be readjusted.

Another object of the invention is to provide an improved mechanism of the character described in which the necessity of using the valve box shown in my contemporaneously pending application Serial No. 680,399, filed February 28, 1912, is done away with, while all the advantages of the construction described in said application are retained in I the use of either form of the improvement herein shown; that is to say, on the cessation of the pumping operation the music sheet will not be moved to one side or the other by the further action of the pneumatics, so that it will'remain in the position in which it was when the traveling movement of the sheet ceased, and in which the necessity of providing a port ateach end of the tracker bar, or two valve-controlled ports, one at each side of the music sheet, is avoided.

' The present improvement includes a double pneumatic, which may be connected with one of the music rolls by a positively 1 acting earn, as shown in the said application hereinbefore referred to if desired.

The present mechanism is so organized and constructed that should the edge of the music sheet opposite to the valve-controlled 1 port be mutilated the operation of the mechanism will not be interfered with. Inother words, where ports are provided at each end ofthe tracker bar for engagement by the traveling web, or where valve-controlled levers are located at each side of the music sheet to be engaged thereby, it follows that if one edge of the sheet is torn or mutilated the mechanism will be operated prematurely .at times, although the perforations therein may be in perfect registration with the tracker board perforations, and the sheet so be thrown ou of register. In the present mechanism, however, it 15 not necessary that both edges of the sheet be in perfect conditiion.

In the drawings accompanying and forming part of this specification, Figure 1 is nism as the same may be applied to a pianoforte, the mechanism for rotating the music sheet rolls being omitted. as this is well known and common; Fig. 2 is a detail view of the port and its movable valve. This figure is intended to show'the position of the valve while the machine is being played, in other words when the sheet is in position across the tracker bar and pumping is proceeding. Fig. 3 is a perspective view of an other form of this IIHPI'OXGd mechanism; Fig. 4 is a detail view of the ports and valvelever as used in connection with the form o-105 pncumatics shomsin Fig. 3; Fig. 5 is a rear view of the double pneumatic shown in F ig.

3. And Fig. 6 is a vertical sectional view of the double pneumatic shown in Fig. 1 illustrating how the tubes 21, 26, 27, and 28 are connected therewith.

Similar characters of reference indicate correspondingparts in the different figures of the drawings.

The present improvement is particularly adapted for self-playing instruments, andin the present embodiment thereof it is shown constructed for that purpose. The music rolls are preferably carried by a suitable casing or box 2 of any desired construction. The music roll 3 carrying the record or sheet. which is to travel over the perforated tracker board 5 is located between a pair of bearing members 6 and 7 carried at opposite ends of the casing. The bearing member 6, fixedly secured at one side of the casing, includes a spring plunger 8 having a socket 9 for the reception of one end of the shaft of the music roll 3. The bearing member 7 may be formed like that shown and described in my contemporaneously pending application and therefore no further description thereof is deemed necessary. The spring pressed plunger 8 acts to maintain the music roll'shaftin engagement with the bearin member7, and this is the main purtwo rolls are operated by suitable driving mechanism which, as hereinbefore stated, it

- is not necessary to show because well known V and common.

In the form shown in Fig. 1, the casing 61' box supports a valve-controlled port, comprising a bracket or, arm 10 having at one end a port 12 having a conduit connection with the double pneumatic hereinafter referred to. This port is fixed so that it usually has-no adjustment at all. Closing this port is a valve 14 carried by a pivoted lever 15, and connected with the bracket by a light spring 16. The forward end 17 of this lever is provided with an adjusting device or screw 18 for engagement with an ad justable member 19 shown in the form of a leaf spring having its inner end riveted or otherwise connected to the valve lever 15, the outer end of this spring being in position to be engaged by the edge of the music sheet and therefore it and its adjusting screw project beyond the tracker bar, the lever and its leaf spring extending through an opening 20 therein, the valve lever and port being maintained in proper cooperative relation by means of the coiled spring 16 hereinbefore described. By adjusting the leaf spring carried by the valve lever it will be brought into position to engage the music sheet and also it will enable various widths of music sheets to be used in the apparatus or permit the transposition of the key of the music to be readily accomplished. From this port 12 a conduitor tube 21 leads to a pneumatic A in a similar manner to that shown and-described in my contemporaneously pending application, so that a further description thereof is not deemed necessary herein.

The pneumatic A is a double pneumatic, comprising a pneumatic A and a pneumatic A", one at each side of a partition or rigid portion 22 secured at its lower end to any suitable support, preferably adjacent to the tracker board casing. These two pneumatics A and A are connected together by a bracket 23 so that they will move in unison, in other words one willcontract while the other is expanding. Connected to these pneumatics is a valve chamber or box 24 having an opening 25 at one part, as at its top, which may be covered with a suitable has connection with a T-shaped coupling I to which the conduit 21 leading from the port 12 hereinbefore described is connected. The valve box is also connected by a conduit 27 with the pneumatic A and is also connected'by a conduit 2'8 with the pneumatic A". A small blceder hole may be formed adjacent to the point where the conduit leading frcm the valve box communicates with the pneumatic A.

In practice the valve in such position relatively to its port that it will just slightly bleed.

In operation the valve lever will be maintained in its normal position when the music sheet is properly tracking. Should the sheet move to the right the port will be ,closed and the mechanism so operated that the sheet will be'returned to its proper tracking position. Should the sheet move to the left; it will further open the port and the mechanism will then be operated to return-the sheet to its proper position. I

From the foregoing it will be. observed that the sheet is thus positively maintained in its proper registering position on the tracker board at all times by being shifted either to the right or to the left as occasion may require, and this by means of a single port at one side of the sheet, which port lever may held I one of which is fixed and the other yieldable, and intermediate which ports a movable valve lever is located, both of these ports being connected with the double pneumatic. in this organization the music sheet rolls and their casing, the tracker bar etc. are substantially similar to that hereinbefore described. The double pneumatic is also substantially similar, except that the conduit connections therewith are slightly different. Carried by the casing is a fixed port 30 carried by a bracket or arm 31 similar to that hereinbefore described, and cooperating therewith is a valve 32 carried by a valve lever 33 similar to that hereinbefore described, so that no further description thereof is necessary. Car ied by the support to which the port just described is'secured, is a pivoted port 34, this being carried by an arm or lever 35 pivotally secured to said support, a stop 36 limiting the inward movement of this lever. Connected with this pivoted port is a conduit 37 running to the pneumatic A, the other port having a conduit 38 running to the pneumatic A". In this form of the improvement it will be observed that there is a port at each side of the valve lever, one being fixed while 'the other is pivoted for swinging movement, a spring 10 connecting the two and effective to hold the yielding port 34 in engagement with the stop pin- 36, so that the necessity of having the valve box shown in Fig. 1. is done away with. The spring 16 tends to pull the valve lever up adjacent to the fixed port 30. If the swinging or yielding port were stationary it follows that when the music sheet moved the forward .end of the valve lever to the left the valve thereof would strike against the port 34 and consequently, as there would be no give to it, the paper would be,torn. But by mounting this port 34 so that it will yield the port will thus give and so permit the paper to push the valve lever farther over. As soon as the valve of this lever touches the yielding port the mechanism commences to return the paper into its proper position. Nhen the paper is tracking properly these two ports will be slightly open or bleeding, the valve lever being between the two so as to give an equal pressure on the bellows of the double pneumatic. \Vhen the paper moves to the right the fixed port will be closed, so that the pneumatic will operate in the regular way to move the sheet roll.

From the foregoing it will be observed that by the provision of a pair of pneumatics operating in the manner described the action of one counterbalance's that of the other so that there is maintained an equilibrium to properly maintain the sheet in its correct position relatively to the tracker bar. It will be understood that the various de lever having a tails may be more or less changed without departing from the gist of this invention or the spirit and scope thereof.

In the double pneumatic shown in Fig. 5 a bleeder hole 42 is located at the lower end of the pneumatic, this being in communication with both the pneumatics A and A.

The 'music roll does not necessarily have to travel over the tracker-bar for the valve to be in the position shown in Fig. 2, but the music sheet has to be over the tracker-bar and pumping must be going on. This figure is intended to show the port slightly bleeding and balancing both neumatics. The music roll sheet is however over the tracker bar. \Vhcn the machine -is inoperative the spring 16 will pull the valve over against the port 12, that is when no pumping is going on, and the valve will be closed. \Vhen the music sheet is in position or is passing over the tracker-bar and the instrument is being pumped the edge of the music sheet presses against the part 19 by reason of the pneumaties and holds the valve 145 slightly open or bleeding which balances the pneumatics, which in turn control themselves by controlling the pressure of the paper against the lever spring 19. .Of course, the spring 16 is properly constructed to permit this action.

I claim as my invention:

1. In an apparatus of the class described,

the combination with a perforated tracker.

bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a port, a swinging valve cooperating with said port and an adjustable member fixed to said valve lever and in position between said lever and the-edge of the sheet to be engaged by the edge of the sheet.

2. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a per forat-ed music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a. port, a swinging lever having a valvecooperating with said port and an adjustable member fixed to said valve lever and in position between said lever and the edge of the sheet to be engaged by the edge of the sheet, said adj ustable member comprising a spring.

3. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar,

said means including a bleeding port, a swlnging lever having a valve cooperating with said port and an adjustable member fixed to said valve lever and in position to be engaged by the edge of the sheet, said adjustable member comprising a s ring.

4. In an apparatus of the class escribed, the combination ith a perforated tracker bar and sheet rolls adapted to carry a perforatcd music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a double. pneumatic, a port, a swinging lever having a valve cooperating -With said port and an adjustable member fixed to said valve lever and in position between said lever and the edge of the sheet to be engaged by the edge of the sheet.

5. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with'those of the tracker bar, said means including a port located. away from the sheet, a swingin lever having a valve cooperating with said ort said valve being located at the rear en of the swinging lever, and an adjustable member fixed to said valve lever and in position to engaged by the edge of the sheet.

6. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar,

said means including a bleeding port, a

swinging lever having a valve cooperating with said port and an adjustable member fixed to said valve lever and adapted to be engaged by the edge of the sheet.

7. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted. to carry a perforated. music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a double pneumatic, a bleeding port, a swinging lever having a valve cooperating with said port and an adjustable member fixed to said valve lever and adapted to be engaged by the edge of the sheet.

8. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforat'ed music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar,

said means including a bleeding port, a movable lever having a valve cooperating with said port and an adjustable member fixed to said valve lever and in position to be engaged by the edge of the sheet.

9. In an apparatus of the class described, the combination with aperforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said-means including a fixed bleeding port, amovable lever, having a valve cooperating with said port, a spring fixed to said valve lever and in position to be engaged by the edge of the sheet, and means foradjusting said spring relatively to said valve lever.

10. In an apparatus of the class de scribed, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a bleeding port, a movable valve cooperating with said port, a member cooperating with said valve and in position to.be engaged by the edge of the sheet, and means for adjusting said member relatively to said valve.

11. In an apparatus of the class de scribed, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another. to insure the proper registration of.

the sheet perforations with those of the trackerbar, said means including arport, a lever having a valve cooperating with said port, a member fixed to said valve lever at the side nearest to the. edge of the music sheet and in position to be engaged by the edge of the sheet, and means for adjusting said member relatively to said valve and comprising an adjusting screw.

12. In an apparatus of the class de scribed, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of, means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a bleeding port, a pivoted valve lever carrying a valve cooperating with said port, asprlng fixed tosaid valve lever and in position to beengaged by the edge of the sheet, and an adjusting screw carried by the valve lever for adjusting said spring. I

13. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means opera- 'said means including'a pair of ports one to insure the proper registration of the sheet perforations with those of the tracker bar', said means including a double pneu matic, a pair of bleeding ports one yieldable relatively to the other, and a valve located between and cooperating with said ports and having a part in position to be en gaged by the edge of the sheet.

In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated'music sheet, 'of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a pair of ports one yieldable relatively to the other, a; swinging valve located between and cooperating with said ports, and an adjustable member carried by said valve and adapted to be engaged by the edge of the sheet.

24. In an apparatusof the class described, the combination with a perforated-tracker bar and sheet rolls adapted to carry a perfo rated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a'-pair of ports one yieldable relatively to the other, a swinging valve located between and-cooperating with said ports, and an adjustable member carried by said valve and adapted to be engaged by the edge of the sheet, said adjustable member comprising a spring.

25. In an apparatus of the cla$ described, the combination with a. perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means. operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of thetracker bar,

yieldable relatively to the other, a swinging valve located betweenand cooperating with said ort-s, and an adjustable member carried by said valve and adapted to. be engaged by the edge of the sheet, said ad= justable member comprising a spring and means for adjustin it and comprising a screw carried by said valve. 7

26. In an apparatus of the class described, the combination with a perforated tracker bar having an opening at one end thereof and sheet rolls adapted to carry a perfo rated music sheet, of means operative to shift one of said partsrelatively to another to insure the proper registration of the sheet perforations with those of thetracker bar, said means including a pair of ports one yieldable relatively to the other, a double pneumatic connected with said ports, and a swinging valve lever having a valve located between andcooperating with said I ports, said lever projecting through the opening in said tracker bar and having a part in position to be engaged by the edge of the sheet.

27. In an apparatus of the class described, the combination with a perforated tracker bar having an opening at one end thereof and sheet rolls adapted to carry a perfo rated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a pair of ports one yieldable relatively to the other, a double pneumatic connected with said ports, and a swinging valve lever having a valve located between and cooperating with said ports,

said lever projecting through the opening in said tracker bar and having apart in position to be engaged by the edge of the sheet, said part comprising an adjustable member.

28. In an apparatus of the class described,

the combination with a perforated tracker bar having an opening at one end thereof and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar,

said means including a pair of ports one yieldable relatively to the other, a double pneumatic connected with said ports, and aswinging valve lever having a valve located between and cooperating with said ports, said lever projecting through the opening in said tracker bar and havin a part in position to be engaged by the edge of the sheet, said part comprising an adjustablemember consisting of a spring fixed to'said valve lever and means carried by said lever for adjusting said spring.

29. In an apparatus of the class described,

the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration ofthe sheet perforations with those of the tracker bar, said means including a double pneumatic, a pair of ports connected with said pneumatic, and a swinging valve lever having 30. Inan apparatus of the class described, t-he'combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar,

the valve thereof inposition to control said ports and apart thereof in position to be engaged by the edge vof the sheet.-

said means including a double pneumatic,

a pair of bleeding ports connected with said other to insure the proper registration ofv tive to shift one of said parts relativelyto another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a'fixed arm carrying a port located away from the sheet, a lever pivoted between its ends and carrying a valve cooperating with said port, a spring for said valve lever, a spring fixed to said valve lever and in position to be engaged by the edge of the sheet, and an adjusting screw carried by said valve leyer and engaging said last spring for adjusting it relatively to the valve lever.

14. In an apparatus of the class described the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a fixed port located behind the sheet, a pivoted lever having a valve at its rear end cooper-- ating with said port, said lever having its forward end projecting forwardly of the tracker bar, a member fixed to said lever and in position tobe engaged by the edge of the sheet, and means carried by said lever for adjusting said member.

15. In an apparatus of the class described, the combination with a perforated tracker bar havingian opening therethrough at one'end and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts'relativelyito anthe sheet perforations with those of the tracker bar, said means including a port, a swinging lever having a valve at its rear end cooperating with said port, said lever projecting through said tracker bar opening, and an adjustable member fixed to said valve lever and in position to be engaged by the edge of the sheet.

16. In an apparatus of the class described, the combination with a perforated tracker bar having an opening therethrough at one end and sheet rolls adapted to carry a perforatedmusic sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a double pneumatic, a port, a swinging lever having a valve cooperating with said port, said lever projecting through said tracker bar opening, and an adjustable member fixed to said valve lever at the side nearest to the music sheet and in position to be engaged by the edge of the sheet.

17. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another sheet.

to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a double pneumatic, a bleeding port, a swinging lever having a valve cooperating with said port, said lever projecting to the front of said tracker bar,and an adjustable member fixed to' said valve lever and adapted to be engaged by the edge of the sheet.

18. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a pair of ports one yieldable relatively to the other, and a valve located between and cooperating with said ports and having a part in position tobe engaged by the-edge of the sheet.

19. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perfo; rated music sheet, of means operativeto shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a pair of ports, one yieldable relatively to the other, and "a 95 swinging valve located between andcoiipcrating with said ports and having a part in position to be engagedby the edge of the sheet 1 20. In an apparatus of the class described, 109 the combination with a perforated-tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one,of said parts relatively to another to insure the-proper registration of the 5 sheet perforations with those of the tracker bar, said means including a double'pneumatic, a pair of ports one yieldable relatively to the other, and a valve located between and cooperating with said ports and 10 having a part in position to be engaged by the edge of the sheet.

21. In an apparatus of the class described,- the combination with a perforated tracker bar and sheet rolls adapted to carry a perfo- 115 rated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a pair of bleed- 12o ing ports one yieldable relatively to the I other, and a valve located between and cooperating with said ports and having a part in position to be engaged by the edge of the' 22. In an apparatus of the class described,

the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another port in one direction,

.forated music sheet, of

neumatic, and a swinging valve lever aving the valve thereof in position to con trol said ports and a part thereof in posi tion to be engaged by the edge of the sheet. 31. In an apparatus of the class described, the combination with a perforated tracker bar' and sheet rolls adapted to carry a perforated music .sheet, of means-operative to shift one of said parts relatively to another to insure the'proper registration of the sheet perforations with those of the tracker bar, said means including a pair of ports located behind the'sheet, and a pivoted valve lever cooperating with said ports and having a part projecting into position to have a part thereof engaged by the edge of the sheet.

32. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a permeans operative to shift orfe of said parts relatively to-anot'her to insure the proper registration of the sheet I perforations with those of the tracker bar,

said means including a pair of ports one a fixed port and the other a swinging port, and a pivoted valve lever in position to control said ports and having a part in position to be engaged by the edge of the sheet.

33. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a pair of ports one a fixed port and the other a swinging port, a pivoted valve lever in position to control said ports and having a part in positionto be engaged by the edge of the sheet, and a stop for limiting movement of said swing? ing port in one direction;

34. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations witlf those of the tracker bar, said means including a pair of ports one a fixed port and the other a swinging port, a pivoted valve lever in position to control vsaid ports and having a part in position to be engaged by the edge of the sheet, a stop for limiting movements of said swinging a spring carried by said valve lever for maintaining it in one posiilion, and a spring between said ports for drawing the swinging port toward the fixed port.

35 In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to perforations with those of the tracker bar,

said means including a, pair of ports one a fixed port and the other a swinging port, a

pivoted valve lever in position to control said ports and carrying an adjustable spring in position to be engaged by the edge of the sheet, a stop for limiting movement of said swinging port in one direction, a spring carried by said valve lever for maintaining it in one position, and a spring between said ports for drawing the swinging port toward the fixed port.

36. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a fixed port, a swinging port, and a swinging valve lever for controlling said ports and having a part thereof in position to be engaged by the edge of the sheet. 7

37. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a double pneumatic, a fixed port, a swinging port, and a swinging valve lever for controlling said ports and having a part thereof in position to be engaged by the edge of the sheet.

38. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with'those of the tracker bar,

said means including a double pneumatic, a fixed port, a swinging port, and a swinging valve lever .for controlling said ports and having a part thereof in position to be engaged by the edge ofthe sheet, said part comprising an adjustable spring.

39. In .an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relatively to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a double pneumatic, a pair of port carrying members one fixed against movement and the other pivotally supported, a stop for limiting movement of the pivotally supported port, a spring for holding said pivoted port in engagement with its stop, a pivoted valve lever having a valve located between and cooperating with said ports, a spring carried by said valve lever and in position to be engaged by the edge of the sheet, and means carried by said valve lever for adjusting said sheet engaging spring.

40. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relative to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a port, a swinging lever pivoted intermediate its ends and having a valve at one side of said pivot cooperating with said port, and a member 00- operating with said valve lever and adjustable from a point at the opposite'side of said ivot and in position to be engaged by the edge of the sheet.

41. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relative to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a bleeding port, a swinging le er pivoted intermediate its ends and having a valve rearwardly of its pivotal point for engaging said port and having at the forward side of said pivotal point a spring in position between said lever and the edge of the sheet to be engaged by the edge of said sheet, and means carried by said valve lever forwardly of its pivotal point for adjusting said spring.

42. In an apparatus of the'class described, the combination with a perforatedtracker bar and sheet rolls adapted to carry a periforated music sheet, of means operativeto shift one of said parts relative to another to insure the proper registration of the sheetperforations with those of the tracker bar, said means including a port, a single movable lever having a valve coiiperating with said port, andfa'ii adjustable member cooperating with said valve lever and in position to be engaged by the edge of the sheet, said single movable valve lever only and its cooperative parts regulatin the adjustment of the music sheet in! both directions.

43,; .In an apparatus of the class described, 'the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music-sheet, of means operative to shift one of said parts relative to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a port, a single movable lever having a valve cooperating with said port, and an adjustable member 006perating with said valve lever and in position to be engaged by the edge of the sheet, said adjustable member comprising a spring, said single movable valve lever only and its cooperative parts regulating the adjustment of the music sheet in both directions.

44. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a pegforated music sheet, of means operative 0 shift one of said parts relative to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a port, a swinging lever having a valve cooperating with said port, a movable member fixed to said valve lever and in position to be engagedby the edge of the sheet, and means located in front of the tracker bar for adjusting said movable member relatively to the valve lever.

45. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of saidflparts relative to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means includingl a bleeding ort, a single swinging lever aving a va ve cooperating with said port, and an adjustable memher-fixed to said valve lever and in position to be engaged by the edge of the sheet.

46. In an apparatus of the class described,

the combination with a perforated tracker bar and sheet rolls adapted to carrya perforated music sheet, of means operative to shift one of said parts relative to another to insure the proper registration of the sheet perforations withthose of the tracker bar, said means including a bleeding port, a single swinging lever having a valve coiipcrating with said port, and .an. adjustable member fixed to said valve lever and in position to be engaged by the edge of the sheet and comprising a spring.

47. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relative to another to insure the proper registration of the sheet perforations with those of the tracker bar, said means including a bleeding port, a single swinging lever having a valve cooperating with said port, an adjustable member fixed to said valve lever and in position to be engaged by the edge of the sheet and comprising a spring, and means carried by the valve lever in front of the tracker bar for adjusting said adj ustable member relatively to said valve lever.

48. In an apparatus of the class described, the combination with a perforated tracker bar and sheet rolls adapted to carry a perforated music sheet, of means operative to shift one of said parts relative to another to insure the pro er registration of the sheet perforations Wit those of the tracker bar, said means including a double pneumatic, a bleeding port, a single swinging lever having a valve cooperating with said port, an adjustable member fixed to said valve lever and in position to be engaged by the edge of the sheet, and means located in front of 10 the tracker bar for adjusting said adjustable member relatively to the valve lever.

Signed at New York city, this 2nd day of April, 191

JOSEPH W. DICKINSON. W'itnesses PETER DUFFY, ABRAHAM 0w.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. C." 

